Michael David "Mike" d'Abo (born 1 March 1944) is an English singer and songwriter, best known as the former lead vocalist of Manfred Mann.

Michael David d'Abo, the son of a London stockbroker, was educated at Harrow School and Selwyn College, Cambridge. He was born in March 1944, is 5 ft 11 in (1.80 m), and has eyes "that honestly seem to change from blue to brown to green, depending on the light" (Pete Goodman, music journalist). D'Abo's original intention at Cambridge was to read theology and become a priest but, faced with "everything to learn" (not least Classical Greek and Hebrew), and a disconnect between the "strange, impractical philosophy" he was being taught and his idealism about "bringing comfort to people" and spreading "understanding in the world," he "became wholly disillusioned" (Rave, November 1966). He switched to economics, also unsuccessfully, and left Cambridge with "a first class jazz collection" but without completing his studies. His musical career began while he was still at Harrow School. He had minor success with a group of Old Harrovians, A Band of Angels that had their own comic strip in a UK pop music weekly, Fab 208. A Band of Angels didn't make the big time but d'Abo did: in August 1966 he joined Manfred Mann ['MM'], already a chart-topping group, as replacement for Paul Jones, who was leaving to go solo.^{[citation needed]}

Michael Diamond, better known as Mike D (born November 20, 1965), is a founding member of New York City hip hop group the Beastie Boys. Mike D raps, sings, and plays drums alongside fellow members MCA, Ad-Rock and Mix Master Mike.

Mike D was born in New York City. Mike was raised in an upper-middle-class Jewish household. He attended Vassar College in Poughkeepsie, New York for six months.

In 1979, Diamond co-founded the band The Young Aborigines. In 1981, Adam Yauch, aka MCA, a friend and follower of the band became their bass player, and from the suggestion of their then-guitar player, John Berry, the band changed their name to the Beastie Boys. By 1983, Adam Horovitz (Ad-Rock) joined to form the lasting Beastie Boys trio, and their sound began to shift away from punk to hip-hop. In 1992, Mike D founded the Beastie Boys' now-defunct record label Grand Royal Records.

In 1993, Mike married film, television and music video director Tamra Davis. They have two boys, Skyler and Davis. He has two brothers, Stephen and David.